Lifting jack



Feb. 10, 1925.

Invenlor JusZusR.K

J. R. KINNEY LIFTING JACK Filed Feb. 28, 1924 Patented Feb. 10, 1925.

4 UNITED STATES PATENT OFFICE.

LIFTING JACK.

Application filed February 28, 1924. Serial No. 695,861.

To all whom it may concern:

Beit known that I, JUSTUS R. KINNEY, a citizen of the United States of America,

and a resident of Jamaica Plain, in the county of Suffolk, in the State of Massachusetts, have invented certain new and useful Improvements in Lifting Jacks, of which the following is a specification.

This invention relates to lifting jacks and particularly to devices of this character designed for use with motor vehicles, the wheels of which are. provided with balloon tires. i i

The object of the invention is the production of a lifting jack: of simple construe tion 'the supporting member of which is adapted to: be moved to a very low position so that it. may be inserted readilybeneath the axle of a vehicle when the tire is deflated. i

The invention consists primarily of a revoluble screw having a carriage movable endwise thereof by means of a nut mounted therein with its thread coacting with the threadof said screw;

The invention consists further of certain novel features ofconstruction and arrangement of parts which will be understood readily by reference to the description of the drawings and to inafter given.

For the purpose of illustrating the invention, one preferred form thereof isv illustrated in the drawings, this form having been found to give satisfactory and reliable results although it is to be understood that the various inst'rumentalities of which the invention consists can be variously arranged the claims to be hereand organized and the invention is not limited to the precise arrangement and organization of these instrumentalities as herein shownand described except as required by the scope of the appended claims.

. Of the drawings:

Figure 1 represents an elevation of a lifting jack embodying the principles of the present invention, the lower portion of the jack being shown in section.

Figure 2 represents an end view of the same, the carriage thereof being cut in section on line 2, 2 on Fig. 1, and

Figure 3 represents a horizontal section of same online 3, 3 on Fig; 1.

Similar characters indicate like, parts throughout the several figures of thedrawm s.

In the drawings 10 is the base of the lift- 7 ing jack, this base consistingof a bent plate having an inclined portion 11, a horizontal top portion 12 and its ends 13 brought together and connected by a rivet 14 as shown in Fig. 1.

The horizontal top portion 12 has an opening therein in which is positioned the lower end of a revoluble screw 15 havin a bearing in the block 16 secured to the base 10 by rivets 17.

- Between the block 16 and top portion 12 the screw 15 has mounted thereon and pinned thereto a bevel gear 18 the teeth of which mesh with a driving pinion 19pinned to a short shaft 20 rotatable in bearings in the block 16 and the inclined portion 11.

The outer end of the shaft 20 is squared as shown in Figs. 1 and 2 at 21. g

The squared portion 21 is adapted to receive the squared socket 22 pinned to the end of an actuating rod 23 which may be of any well known construction.

The screw 15 may be of any length desired.

The screw 15 is surrounded by a bentplate 2 1 the side walls of which are parallel and spaced apart, one side wall having two cylindrical openings 25, 26 therein in alinement with similar openings in the other side wall.

In the openings 25,. are disposed the trunnion ends of a cylindrical guide member 27 having a transverse hole 28 therein through which the screw 15 extends.

This member 27 may oscillate in its bearings 25 andforms a guide for said screw 15.

In the openings 26 are disposed the trun-' nion ends of another cylindrical member 29 having a threaded opening 30 extending transversely thereof the threads of which coast with the threads of said screw 15 which extends through said opening 30.

The ends of the'plate 2 1 extend laterally from said screw 15 and are connected by rivets 31, this extension forming a support 32 on which the axle A is adapted to rest.

The upper edges of the extension 32 are inclined downwardly toward the screw 15 and when the axle A restsupon this support 32 and against t-hevertical edges 33 as shown in Fig. 1 there is verylittle danger of the axle being displaced accidentally from the support 32.

iVhen the load is positioned upon the sup port 32 the entire carriage 24: is liable to tilt or cant thereby making it ditlicult to operate the screw 15 unless some provision is made to prevent such tilting.

To accomplish this object the carr go 94' is provided with two transversely disposed pins 34 on each of which is disposed a grooved roller 35 adapted to travel over the periphery of said screw 15 when thecarriage 2 a is raised or lowered.

Owing to the use of these rollers the carriage 24 may move freely lengthwise ot' the screw 15 whenever the latter is rotated.

Whenever it is desired to insert the sup-- port 32 beneath an axle A the carriage 2e is moved manually about the axis of the screw until about the right height is reached and then the support is placed beneath the axle and brought into contact therewith.

Further rotation of the carriage is prevented by the load upon the support 32 and it rotary movement is imparted to the screw 15 by the driving mechanism 18, 19 the carriage will be raised on account of the coaction of the threads of screw 15 and nut 30.

This makes a very simple but effective device for raising and lowering motor vehicles being particularly adapted for such vehicles equipped with balloon tires owing to the fact that the support 32 may be lowered well toward the base 10.

It is believed that the operation and many advantages of the invention will be apparent without further description.

Having thus described my invention, I claim:

1. The combination of a base; a screw unsupported at its upper end and the lower end of which is revolubly mounted in supporting hearings in said base; means between said bearings for rotating said screw and prc venting its displacement; a carriage mov able endwise of said screw having a support at one side of said screw; and a nut carried by said carriage coacting with said screw.

2. The combination of a base; a screw the lower end of which is revolubly mounted in hearings in said base means for rotating said screw; a carriage movable endwise of said screw having a support at one side of said screw; a nut carried by said carriage coacting with said screw; rollers carried by said carriage preventing the tilting thereof by the weight upon said support; and a transversely extending member mounted in said carriage and having a cylindrical hole therethrough to receive said screw and form a guide therefor.

3. The combination of a base; a screw the lower end of which is revolubly mounted in hearings in said base; means for rotating said screw; a carriage movable endwise of said screw having a support at one side of said screw; a nut carried by said carriage coacting with said screw; rollers carried by said carriage preventing the tilting thereof by the weight upon said support; and a transversely extending member mounted to oscillate in said carriage and having a cylindrical hole therethrough to receive said screw and form a guide therefor.

4-. The combination of a base; a screw the lower end of which is revolubly mounted in bearings in said base; means for rotating said screw; a cylindrical member adapted to oscillate in bearings of said carriage and having a threaded hole extending transversely thereof, the thread of which coacts with the thread of said screw.

5. The combination of a base; a screw the lower end of which is revolubly mounted in hearings in said base; means for rotating said screw; a cylindrical member adapted to oscillate in bearings of said carriage and having a threaded hole extending transversely thereof, the thread of which coacts with the thread of said screw, and a guide member for said screw adapted to oscillate in bearings formed in said carriage.

6. The combination of a base consisting of a bent plate the ends of which are riveted together; a block secured within said base: a revoluble screw the lower end of which has a bearing in said block; a gear fixedly secured to said screw; a pinion meshing therewith; a shaft therefor revoluble in hearings in. said block and plate; means tor rotating said shaft; a carriage movable endwise of said screw; and a nut carried thereby coacting with said screw.

7. The combination of a base; a screw revolubly mounted in bearings in said base: means for rotating said screw; a nut on said screw having oppositely disposed cylindrical trnnnions; a guide member on said screw l'xaving oppositely disposed cylindrical trunnions; and a carriage consisting of a bent plate surrounding said screw with its ends extending to one side of said screw and Se cured together to form a support, said plate having bearings for said trunnions.

8. The combination of a base; a screw revolubly mounted in bearings in said base: means for rotating said screw; a nut on. said screw having oppositely disposed cylindrical trnnnions; a guide member on said screw having oppositely disposed cylindrical trunnions; a carriage consisting of a bent plate surrounding said screw with its ends extending to one side of said screw and secured together to form a support, said plate having bearings for said trunnions; and memhere at the upper and lower ends of said carriage contacting with said screw to prevent the tilting of said carriage.

9. The combination of a base; a screw revolubly mounted in hearings in said base;

10 bearings for said trunnions; and rollers at the upper and lower ends of said carriage contacting With said screw to prevent the tilting of said carriage.

. Signed by me at 746 Old South Building,

Boston, Massachusetts, this 27th day of Feb- 10 ruary, 1924:.

JUSTUS R. KINNEY. lVitnesses WALTER E. LOMBARD, NATHAN C. LOMBARD. 

